Role of pressure-induced stacking faults on the magnetic properties of gadolinium

Experimental data show that under pressure, Gd goes through a series of structural transitions <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi>hcp</a:mi><a:mo>→</a:mo><a:mi>Sm</a:mi></a:mrow></a:math>-type (close-packed rhombohedral) <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:mo>→</b:mo><b:mi>dhcp</b:mi></b:mrow></b:math> that is accompanied by a gradual decrease of the Curie temperature and magnetization till the collapse of a finite magnetization close to the dhcp structure. We explore theoretically the pressure-induced changes of the magnetic properties, by describing these structural transitions as the formation of fcc stacking faults. Using this approach, we are able to describe correctly the variation of the Curie temperature with pressure, in contrast to a static structural model using the hcp structure. Published by the American Physical Society 2024